2129-capitalize-the-title.js

/**
 * 2129. Capitalize the Title
 * https://leetcode.com/problems/capitalize-the-title/
 * Difficulty: Easy
 *
 * You are given a string title consisting of one or more words separated by a single space,
 * where each word consists of English letters. Capitalize the string by changing the
 * capitalization of each word such that:
 * - If the length of the word is 1 or 2 letters, change all letters to lowercase.
 * - Otherwise, change the first letter to uppercase and the remaining letters to lowercase.
 * Return the capitalized title.
 */

/**
 * @param {string} title
 * @return {string}
 */
var capitalizeTitle = function(title) {
  return title.split(/\s+/).map(word => {
    return word.toLowerCase().replace(/^\w/, l => word.length > 2 ? l.toUpperCase() : l);
  }).join(' ');
};